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Advertisement: Of the many over-the-counter medications marketed for the relief of sinus headache. SineEase costs the least per dose. And SineEase is as effective per dose as the most effective of those other medications. So for relief from sinus headaches, SineEase is the best buy.

Which of the following, if true, most seriously weakens the argument above?

(A) Most of the over-the-counter medications marketed for the relief of sinus headache are equally effective per dose in providing such relief.

(B) Many of the over-the-counter medications marketed for the relief of sinus headache contain the same active ingredient as SineEase.

(C) People who suffer from frequent sinus headaches are strongly advised to consult a doctor before taking any over-the-counter medication.

(D) An over-the-counter medication that is marketed for the relief of symptoms of head cold is identical in composition to SineEase but costs less per dose.

(E) The per dose price for any given over-the-counter medication marketed for the relief of sinus headache is higher for smaller packages than it is for larger packages.

Advertisement: Of the many over-the-counter medications marketed for the relief of sinus headache. SineEase costs the least per dose. And SineEase is as effective per dose as the most effective of those other medications. So for relief from sinus headaches, SineEase is the best buy.

Which of the following, if true, most seriously weakens the argument above?

(D) An over-the-counter medication that is marketed for the relief of symptoms of head cold is identical in composition to SineEase but costs less per dose.

The passage only states that " of the many....."/ not "of all", SineEase coest the least per dose -----> There's probably a cheaper one and if there is such one, the argument may be weakened ----> D shows that there is a cheaper one medication with the same composition to SineEase's ----> SineEase is not the best---> the argument is weakened.

Also vote for D. The other medication is identical in composition to SineEase but costs less per dose --> such medication has the same effect in treating the headache and cheaper than SineEase.
D weakens the arguments.

D is the best choice. If another drug has the same composition, then it would have the same effect. And if this alternative has a lower cost per does than SineEase, then the advertisement is making a false claim.

However D is deeply flawed. The other medication is intended for head cold , so its doses could significantly differ from those of SineEase. Hence
we cannot assume that it would be cheaper to take then SineEase. Moreover, its doses could be so smaller then those of SineEase that it would be much more expensive to use it instead of the original medication .

Nevertheless, as I already said, I would pick this one since other choices are clearly out.